Continuous filter for cyaniding and the like.



PATEBTTED'J'AN. 2.1, 1908. B. HUNT.

CONTINUOUS FILTER FOR OYANIDING AND THE-LIKE.

APPLICATION FILED MAR. 28. 1907.

2 SHEETSSHEBT 1.

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PATBNTED JAN. 21, 1908.

B. HUNT CONTINUOUS FILTER FOR UYANIDING AND THE LIKE. APPLICATION FILED MAR.28.1907.

, zsmms snmr zv BERTRAM HUNT, OF SAN FRANCISCO, CALIFORNIA.

CONTINUOUS FILTER FOR CYAEHDING AND T To all whom it ma concern."

' Be it known t at I, BERTRAM HUNT, a British subject, residing at San Francisco in the county of San Francisco and State of California, have invented new and useful Irnprovements in Continuous Filters for Cyaniding and the Like, of which the following is a specification.

This invention relates to improvement in continuous filters for cyaniding andother purposes, the object of the invention being to, provide a filter'which will be rapid in its action, in which the filtering medium will alw ys be maintained at its highest efficiency, which will be automatic in its working, thus requiring little attention, which will require few repairs, and in which thepower required for operating the movable pa s shall be as small as possible.

In the accompanying drawings, Figure 1 is a vertical section of the apparatus; Fig. 2 an enlarged section through the carriage; ifig. 3 is a broken plan view of the apparatus; is an enlarged section through the Er bell; Fig. 5 is an enlarged detail sectional view of a support for the filter.

Referring to the drawing, 1 indicatesa ircuiar bed of concrete or like material, formed with exterior and nterior circular walls 2, 3, the surface of the} end between said walls sloping dowiiwardly outward, and the space between the wa ls forming a chamber for the filtered cyauid solution, the top of said chamber being formed by the filter bed, of which the l' i'lowing is the coi'istruction. .Upon said walls rest metallic rings 5, 6, having at the lower edgcsoppositcly disposed flanges 7, 8, upon which are supported radial beams 10, upon which rest bars .1. Said bars are triangular in cross section, and are arranged with apices upwards and with their bases in close proximity to, but not touching, each other, being spaced apart at a suitable distance, say, one-sixteenth of an inch. The angular spaces between said bars are iilled with clean sand, carefully screened, so as to consist of particles of approximately uniform size and of such iincncss that it cannot pass through the spaces between the bottoms of the bars, and this sand constitutes the filtering medium. The metallic rings 5, 6, extend above the top of the bars to a. height commensurate with the amount of pulp to be fed to the "idler. This pulp is fed by a revolving carriage in the manner which I will now describe.

Specification of Letters Patent. Application filed Maui 28.1907. Serial No. 365,194-

Patented Jan. 21,1908.

Resting centrally on the concrete bed is a tubular step 12, having an annular shoulder, 13, and i pon said shoulder rotates a hollow hub 14 of a wheel 16. From said hub radiate spokes 15, which extend slightly upward and are attached at the outer end to the rim of.

the wheel to which are secured brackets 17 in which are mounted the axles or rollers 20. Said rollers travel on the top of the outer ring 6, which thus constitutes a circular track for said rollers. Secured on the outside of the wheel 16 is a channel-shaped sheave 2]. by means of which the wheel can be driven by a rope from any suitable source of power. Supported by two of the spokes of the whee 16 is an inner beam, 22, and supported betweenthe junctures of said spokes with the rim of said wheel is an outer beam 23 mounted in suitable hearings on the inner side of said beams are axles 24 of wheels 25 which run on the inner and outer rings 5, 6. These beams and wheels constitute a carriage, which revolves over the filter bed and carries the ends of the pipes for discharging pulp clean sand, and water, and also carries the means for removing the failings.

The pulp which is to be filtered is supplied by a chute, 26, to a hopper, .27, the bottom of which rests within the top of a tube, 35, the lower end of which fits snugly within the upper end of the hollow hub 14, and hasa circular flange, 31, resting u Jon the top of said Lub. Said tube is divided into upper, intermediate and lower chambers, 28, 29, 30. The upper chamber 28 is connected with the hopper and from the side thereof a pulp pipe 32 extends in a radial direction, the end of said pipe being bent at right angles and discharging on the rear side of a distributer 33. Said distributeris supported from the carriage by means of hanger rods, 34, connected to the bottom 36 of the distributer, which slopes downward in two directions. The front or advancing portion forms the bottom of the clean sand distributer box 37 while the rear portion forms the bottom of the pulp distributer box 38. The sides of said boxes are formed by the central wall 40, and

the front and rear walls 4] and 42. The pulp pipe discharges into the rear, or pulp tributer box, from which the pulp is distributed by means of small holes 43, in the bottom of the rear wall of said box, lowing down over the sloping extension of the bottom of said box, and being uniformly distributed over the lilter bed.

sloping extension 47 0 said boxto the filter be The intermediate chamber,29, is connected with a clear water inlet pipe, 50, which extends down through the bottom of the hoppenand from said chamber 29 lead radial pipes 51 extending over the filter bed andada ted to discharge clear water thereover. 11 order to remove the tailings after the cyanid solution has been filtered therefrom, there is provided a sloping scraper 52 the lower edge of which travels in contact with thefilter bed and which is supported by means of end blocks 53, suspended by hangers, 54, from the beams 22, 23, and also by ncglular brackets, 55, extending rearwardly n upwardly and attached to said beams.

a The rear upper edge of'said scraper is' connected with the tubular casing 56 of a screw conveyer 57, said ciasing being open opposite to said scraper. The shaft 60 of sai conveyer is driven by a bevel gear 61, meshing I with a bevel gear 62, on a vertical shaft 63,

mounted in suitable bearings on the tube 35,

said shaft carrying a car wheel, 64, which meshes with agear w ieel 66, carried by a rope sheave. 67, by means of which power may be applied from any distant source. In this manner the tailings are conveyed to the chamber, from which they drop through the tubular step 12 into. a chamber 68 from which they are conveyed to the outside of the bed by means of a screw conveyer, 69.

' The clear liquid which is drawn through the filter falls into com artments 70, which are separated by radia walls 71, and connecte by valves .72, with a circular main pipe 73, outside the concrete bed. After the scraper has passed over the filter bed and removed from the top of said bed the fine residues of the pulp or slimes, the part of the l filter bed between the edge of the scraper and the distributer then consists of clean sand only, through which air can pass very readily, and the resultis that, owing to the porous quality of this clean sand and the readylpassage of air therethroughflhe vacuum which is furnished. to draw the solution through the filter. is greatly impaired, It is for the purpose of avoiding the reduction of the vacuum which would thus be occasioned, that the receptacle for the solution is divided into compartments, and each compartment inturn, as the part of the carriage between the edge of the scraper and the distributer passes thereover, is cut oil from the .main pipe 73. This is done by means of arms, 74, 75, secured to the. carriage, which arms operate upon thevalves controlling the .4 compartments the front arm 74 turning the valve to bed the material to'be filtered,f"a scrap close the same and the rear arm 75 turning it to re-open it, In consequence, said valve is closed while the porous portion of the filter bed is passing immediately thereover.

The apparatus isintended particularly for the treatment of what is known as'slimed or very finely crushed material, which maybe here designated as pulp. I Before arriving at the machine, the pulp is preferably treated by a hydraulic classifier to separate out a portion of the sandy part of the pulp. The sandy portion is carried by the pipe 44 into the sand distribut'er" box and is then distributed over'the filter. bed immediately behind the scraper. The slimy, or clayey portion, is fed into the hopper by the chute 26, andis carried by the pup pipe 32 and is fed into the pul distributer box; thenceit is distribute over the filter bed behind the clean sand. A vacuum is produced in the main pipe 7 3, which draws liquid and air through the filter j bed into the several compartments of the receptacle therefor. As theicarriagerotates, the scraper takes the tailings of residue eff, and these tailings are carried into the. veyer and discharged. Wash "w'aterfrna discharged by the radial pipes 51 u'p' filter bed at any desired dlstance behind carriage to wash the pulp after thejsolu has been drawn ofl.

I'claim:- I p 1. A filter comprising" a station p H bed, a feeder movable over said bed or di tributing thereover the material] tered, a scraper also movabl p j j I for. removing. the residual; means for moving said-ifeederi and scraper over said bed, substantiallyias described 2. A filter compris'iiiia "sta l nular filter bed, a feeder or feeding o he he ntqsa d ter scraping the residual material from said' bed," and means for revolvin saidgfeederfiand scraper over the bed, su bstantially as described. J

A filter, comprising anyannular filter bed,'i a carriage revolv ng thereover and means supported by said carria e-for dis char ing on said bed the mate'iia to bev tere( and for removing from the filtenbd the residual materialthus tered,'subst'an-. tially as d cribed. I p *4. A filti, comprising. a stationaryj'an nular filter bed, a"carriage revolving ever said bed, a feeder for feeding on to sand bed the material to be filteredfscraper forremo v ing from said bed the residual material, a conveyer to which the material is delivered by the scraper and adapted, to convey the material from the bed, said feeder, scraper andco'nveyer being movable with the carriage, and means for automatically operating said conveyer with the movement of the carriage, substantially as described.

on said Wails, a up distribu w m 1- supp awed my siml ill'liLHS 0 @01- to the bed to said (:m'riage,

L 1: its clean sand 11 a" -05? e scraper, said ll-i iii? to Wiili'll lam a m and tribute? arm: ged n aver the filler bed in the? a. scraper for removing fun. residual imilerizii, a cuiivef; material delivered by the an adapted i0 C(lllJQ-ff the Ulzliil2ll from said feeder, qlislrilmi-c'r, scraper and ways? being movable with the carriage, and means for nuiomativnllj; opium 11;: said {'01 veyei" with il mowmunl vi ills: earrings, substantiall i as described 6. Fl l'iltm' comprising a suitable linlj'i'i haw-- ing inns; d older ciisulm walls 20 mm therbetv an annular rec/3 Clear liqu a stationary mum 011 538.55! Willis, a i

ducting puly ii'oz ii a central point ralative means for csmluctiiig residual material irom the sciwier to sucli ccnlaizzl paint, substantially 5 described.

7. j: illiil cmnpr innur and uuilai 'Lll '-"1)l (l2fiii3l?ii an annular receptacle elm"; liquid, ii 011 said walls, UK! said walls, :1

ising a suitable liaise ham mnulur walls in term for the can'ing'v. adapled to 'il'ilYQl pulp diizii'lliiiter, a clvan sand stationary ag nulm iiltcr bed disli'ilmlvr a d a SCKSLPM suppurivd by said as (ll-scribed ln lesiimuny w ii-W201"; i. have hereunto set my inlaid in the presence 0f two subscribing Witnesses. I

Bi lillliilill HUNT.

11" it msscs:

Fimiicislxl. Winding D. B. Rmiliiiws 

